Swinton won the trophy by beating Widnes on a two legged final by the score of 21–15 aggregate.
During the following week, the Northern Rugby League decided, after publicity from the Government, to suspend the championship.
The Lancashire Cup started on Saturday 2 March 1940 and was played on consecutive weekends.
The club had been struggling to survive for a few years with falling attendances and the economic depression and it was obviously not possible for the town to sustain two top teams.
The number of teams entering this year's competition decreased by one with the loss of St Helens Recs to a total of 12.